2008-12-04_PERMIT FILE - C1994082 ‎(35)‎

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 12/4/2008
• Doc Name: Sediment Ponds SEDCAD4 Results
• Section_Exhibit Name: Tab 13 Attachment 13-12 Appendix 13-12.1
• Media Type: D
• Archive: No

•

~7
TR-37
Yoast Mine
Pond 012A Design
HYDROLOGIC INPUT PARAiV1ETERS
SEDCAD 4
Channel YPM-7
Watershed ID -Structure 8 - SVVS1
Watershed Area: 36.8
Curve Number:
HYDROLOGIC CURVE AREA
WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 24.79
Aspen/Mountain Shrub Good (>70%) 8 30 8.40
AspenlMountain Shrub Good (>70%) C 47 0.77
Sagebrush Good (>70%) B 35 2.57
Sagebrush Good (>70%) C 47 0.22
Total 36.75
CURVE NUMBER 58
SEDCAD 4
Channel YPM-7A
Watershed ID -Structure 8 - SWS2
Watershed Area: 13.1
Curie Number:
HYDROLOGIC CURVE AREA
WATERSHED TYFE VEGETATION COVER SOIL GROUP NUMBER (acres)
Reclaimed Fair (30% - 70%) B 71 13.11
Total 13.11
CURVE NUMBER 71
Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation
Baseline Report Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are
presented in Attachment 13-12, Postmining Drainage and Sediment Control ,Table 13-12.1. Values were
adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service,
1986.
SEDCAD4
Channel YPM-T
Watershed ID -Structure 8 - SWS1
Sedimentology: k factor
SOILS MAP UNITlSOILS HYDROLOGIC SOIL AREA
SERIES GROUP k FACTOR (acres)
Reclaimed B 0.32 24.79
34C/D/E/F - Coutis silt loam B 0.37 3.4
46C/D - Splitro loam C 0.24 1.0
53C/D/E/F - Winevada loam B 0.23 7.9
Total 37.1
Weighted k Factor 0.30
13-12.1-75
Revised 02/08